lalinfernece_pipe_utils.py: do not lengthen required segment when lalinference psd is not used.
Currently, if psd.xml.gz or bayeswave psd is used with minimum_realizations_number
being specified, the codes break. It is because when psd.xml.gz or bayeswave psd is used lalinference_pipe
does not prepare long enough segment for PSD estimation while you require at least minimum_realizations_number
realizations for PSD estimation. This patch fixes this issue.
cc: @vivien @john-veitch